NI-CAN Isolation with Multi-Port ConsiderationsHardware: Industrial Communications>>CAN
Problem: What level of isolation at the physical layer is provided on NI-CAN boards? Solution: The CAN controller, microprocessor, and other hardware which interfaces a given PC bus is optically isolated up to 500 V (except for the optional shield pin) from the physical layer, which consists of the CAN transceivers and other supporting hardware. This is implemented using 5 V DC-DC converters with 500 V isolation for internal powering, and a 5V DC regulator for external powering including protective circuitry in case of miswiring. Additionally for multi-port cards, 500 V optical isolation between ports allows for independent use in distinct networks. The USB-CAN High-Speed physical layer is powered internally from the USB through a DC-DC converter, and is optically isolated up to 500VDC (withstand 2s max) channel-to-bus. This isolation protects your NI-CAN hardware and the PC it is connected to from being damaged by high-voltage spikes on the CAN bus. For more information regarding NI-CAN hardware specifications see the Chapter 3, NI-CAN Hardware, and Appendix C, Specifications in the NI-CAN Hardware and Software Manual linked in the related links below. Related Links: NI-CAN Hardware and Software Manual Attachments:
Report Date: 04/12/2005 Last Updated: 03/20/2009 Document ID: 3KBD884B |
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